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RISS 인기검색어
- 검색키워드
- 저자 : S. Tkaczyk (검색결과 3 건)
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DC-conductivity of thin films of 1,4-cis-polybutadiene doped with SiC
S.W. Tkaczyk 한국물리학회 2009 Current Applied Physics Vol.9 No.6
In this paper the results of DC-conductivity investigation of 1,4-cis-polybutadiene thin films doped with 5% weight of silicon carbonate (SiC) of nanocrystalline form with the size of grains being about 20 nm are presented. The aim of the study was to receive a knowledge about the electrical properties and DC-conductivity mechanisms depending on film thickness, temperature and electric field magnitude. The investigated films thickness ranged from 1 to 12 ㎛. The investigations were carried out for both undoped and doped with nanocrystalline SiC polymers. The current flow through the material bulk changed from 10-12 to 10-4 A with applied electric fields of 0 to 3 × 107 V/m and temperature of the film varying from 15 to 325 K. It was observed that the magnitude of the current flow through the investigated material bulk is governed by a phase state of the polymer and the presence of SiC in the bulk. The charge transport through the material bulk is controlled by the Poole-Frenkel phenomenon as well as by hopping. The determined activation energies were between kT and 0.36 eV. In this paper the results of DC-conductivity investigation of 1,4-cis-polybutadiene thin films doped with 5% weight of silicon carbonate (SiC) of nanocrystalline form with the size of grains being about 20 nm are presented. The aim of the study was to receive a knowledge about the electrical properties and DC-conductivity mechanisms depending on film thickness, temperature and electric field magnitude. The investigated films thickness ranged from 1 to 12 ㎛. The investigations were carried out for both undoped and doped with nanocrystalline SiC polymers. The current flow through the material bulk changed from 10-12 to 10-4 A with applied electric fields of 0 to 3 × 107 V/m and temperature of the film varying from 15 to 325 K. It was observed that the magnitude of the current flow through the investigated material bulk is governed by a phase state of the polymer and the presence of SiC in the bulk. The charge transport through the material bulk is controlled by the Poole-Frenkel phenomenon as well as by hopping. The determined activation energies were between kT and 0.36 eV.
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Photo-induced optical effects in Nd-containing oxides
A. Majchrowski,M. Swirkowicz,S. Tkaczyk,L. Jaroszewicz,I.V. Kityk,K. Ozga 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Photo-induced second harmonic generation (SHG) and two-photon absorption (TPA) responses in the single crystals of neodymium containing compounds (NdGaO_3, K_5Nd(MoO_4)_4, α-RbNd(WO_4)_2, and NdAl_3(BO_3)_4) were found. The temperature dependences of the SHG and TPA stimulated by bicolor laser treatment at 1320 nm and 660 nm were studied as well. We found that in nanocomposites consisting of a polymer matrix and nanocrystals of mentioned above neodymium compounds nonlinear optical effects are substantially stronger when more polarizable ions such as Rb and K are present. The maximal achieved value of the SHG for 1320 nm laser beam was equal to about 0.25 pm/V for the nanocomposite containing RbNd(WO_4)_2. The maximal value of the TPA under the same conditions of the photo-treatment was equal to about 1.6 cm/GW also in case of this nanocomposite.
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UV-induced red shift of lithium borate nanocrystallites
J. Pisarek,M. Piasecki,S. Tkaczyk 한국물리학회 2011 Current Applied Physics Vol.11 No.3
UV 10 ns nitrogen laser pulses at 337 nm give substantial shift of energy gap for LiB_3O_5 (LBO) nanocrystals (NC) with sizes below 200 nm. The mechanically prepared powders of the NC were put between the MgF_2 UV-transparent windows. The power density of the UV-photoinducing beam was varied up to 2.1 GW/cm^2. The mechanically prepared LBO NC possessed the sizes varying within the 120 nm―350 nm. The effect exists only for the NC below 190 nm. The photoinduced changes disappeared after about 180 s of switched off of the photoinduced UV beam. For the NC sizes below 125 nm the observed red shift is significantly less.
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